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Chin. Phys. B, 2013, Vol. 22(8): 084203    DOI: 10.1088/1674-1056/22/8/084203
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Simple formula for the ionization rate of diatomic molecules in an intense laser field using the velocity gauge

Tang Zeng-Hua (唐增华), Li Yong-Qing (李永庆), Ma Feng-Cai (马凤才)
Department of Physics, Liaoning University, Shenyang 110036, China
Abstract  We derive a general ionization rate formula for the system of diatomic molecules in the velocity gauge. A more concise expression of the photoionization rate in the tunnel region is obtained for the first time. Comparisons are made among the different versions of strong-field approximation. The numerical study shows that the ionization rate in the velocity gauge is underestimated by a few orders compared with that in the length gauge. Our simple formula of ionization rate may provide an insight into the ionization mechanism for the system of diatomic molecules.
Keywords:  strong-field approximation      gauge invariance      tunnel ionization  
Received:  12 November 2012      Revised:  21 December 2012      Accepted manuscript online: 
PACS:  42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)  
  33.80.Eh (Autoionization, photoionization, and photodetachment)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11274149) and the Natural Science Foundation of Liaoning Province, China (Grant No. 20121032).
Corresponding Authors:  Li Yong-Qing, Ma Feng-Cai     E-mail:  yqli@lnu.edu.cn; fcma@lnu.edu.cn

Cite this article: 

Tang Zeng-Hua (唐增华), Li Yong-Qing (李永庆), Ma Feng-Cai (马凤才) Simple formula for the ionization rate of diatomic molecules in an intense laser field using the velocity gauge 2013 Chin. Phys. B 22 084203

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